presidentbarackobamaandrepublican candidate, mitt romney, spent the weekend preparing to go head-to-head. romney used senator portman of ohio to act as his opponent. john carrey played the president. they said both men are ready. >> i think that both are excellent in their own way. you can argue that mitt has had a lot more recent experience. >> the president has a day job. the president has been president and has not had the time to practice. all we hear about is how much mitt romney is practicing, practicing, practicing wherever he goes. >> reporter: today, president barack obama headed to las vegas while mitt romney attended church in massachusetts. >>> in afghanistan, five people are dead including two americans after a firefight broke out in the eastern part of the country. an insider attack similar to the ones that have killed dozens of nato forces. drew levenson tells us how this a tack marks a grim milestone. [gunfire] >> reporter: this weekend marked a deadly milestone in afghanistan. 2,000 american soldiers killed since the war began nearly 11 years ago t. happened at